Eagle Eye: Concerns in the secondary

Safety Keelan Johnson had been on the Eagles' practice squad since Sept. 3. (USA Today Images)

With their secondary depleted by injuries, the Eagles on Tuesday promoted safety Keelan Johnson from the practice squad to the 53-man roster.

To make room for Johnson, the Eagles released linebacker Emmanuel Acho.

Johnson, an undrafted rookie from Arizona State, spent the preseason with the Dolphins before being released as part of the final roster cutdown on Aug. 31. The Eagles signed Johnson to the practice squad on Sept. 3.

The 5-foot-11, 212-pound Johnson was a four-year letterwinner at ASU and ranked 11th in the NCAA Division-I with five interceptions as a senior, when he was named first-team all-Pac 12.

The Eagles have three safeties who are banged up -- starter Earl Wolff has missed the last four games with a knee injury suffered against the Packers, and backups Kurt Coleman (hamstring) and Colt Anderson (knee) both got hurt in the loss to the Vikings Sunday.

Acho spent the preseason with the Eagles and actually survived final cuts on Sept. 1 before being released a day later when the Eagles claimed linebacker Najee Goode on waivers.

The Eagles re-signed Acho on Oct. 21 and he played in six of seven games since, getting 65 snaps on special teams and 23 on defense -- all against the Raiders. He was originally a sixth-round draft pick of the Browns last year but spent the entire season on injured reserve with a leg injury.